A newborn is literally a baby animal (including us human animals) who was born in the past month. Figuratively, newborn describes anything recently born or created, like a newborn interest in vocabulary.

Little babies are newborns until they're a month old — four weeks is the official human newborn cut-off age. Then they’re just regular ol’ babies. Other things can be newborn as long as they’re brand new — a newborn restaurant was opened recently, a newborn celebrity might be 18 but she just got famous. You could have a newborn fear if you recently became scared of something. Most newborns are not scary, though. (Unless you’re babysitting one.)

Definitions of newborn

adj recently born

“a newborn infant”
immature, young
(used of living things especially persons) in an early period of life or development or growth

adj having just or recently arisen or come into existence

“with newborn fears”
not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered

n a baby from birth to four weeks

neonate, newborn baby, newborn infant
show 7 types...
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liveborn infant
infant who shows signs of life after birth
low-birth-weight baby, low-birth-weight infant
an infant born weighing less than 5.5 pounds (2500 grams) regardless of gestational age
postmature infant
infant born after 42 weeks of gestation; usually shows signs of placental insufficiency
preemie, premature baby, premature infant, premie, preterm baby, preterm infant
an infant that is born prior to 37 weeks of gestation
SGA infant, small-for-gestational-age infant
an infant whose size and weight are considerably less than the average for babies of the same age
stillborn infant
infant who shows no signs of life after birth
term infant
infant born at a gestational age between 37 and 42 completed weeks
Type of:
babe, baby, infant
a very young child (birth to 1 year) who has not yet begun to walk or talk

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